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CVE-2024-42108— net: rswitch: Avoid use-after-free in rswitch_poll()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于net:rswitch模块中在rswitch_tx_free()中，由于skb和gq_skbs[gq_dirty]实际上是同一个指针，skb首先被dev_kfree_skb_any()释放，然后使用skb->len更新接口统计信息，导致释放后重用问题。

CVSS 9.8 · Critical EPSS 0.63% · P49

Possible ATT&CK Techniques 1 AI

T1498.002 · Reflection Amplification

Affected Version Matrix 7

VendorProduct Version RangeStatus
Linux Linux 0aeec4bb6a9fc963932bf3c929bdf27d835d44e9< 4a41bb9f2b402469d425a1c13359d3b3ea4e6403 affected
271e015b91535dd87fd0f5df0cc3b906c2eddef9< 92cbbe7759193e3418f38d0d73f8fe125312c58b affected
271e015b91535dd87fd0f5df0cc3b906c2eddef9< 9a0c28efeec6383ef22e97437616b920e7320b67 affected
6.8 affected
< 6.8 unaffected
6.9.9≤ 6.9.* unaffected
6.10≤ * unaffected
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I. Basic Information for CVE-2024-42108

Vulnerability Information
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Vulnerability Title
net: rswitch: Avoid use-after-free in rswitch_poll()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: rswitch: Avoid use-after-free in rswitch_poll() The use-after-free is actually in rswitch_tx_free(), which is inlined in rswitch_poll(). Since `skb` and `gq->skbs[gq->dirty]` are in fact the same pointer, the skb is first freed using dev_kfree_skb_any(), then the value in skb->len is used to update the interface statistics. Let's move around the instructions to use skb->len before the skb is freed. This bug is trivial to reproduce using KFENCE. It will trigger a splat every few packets. A simple ARP request or ICMP echo request is enough.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于net:rswitch模块中在rswitch_tx_free()中，由于skb和gq_skbs[gq_dirty]实际上是同一个指针，skb首先被dev_kfree_skb_any()释放，然后使用skb->len更新接口统计信息，导致释放后重用问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0aeec4bb6a9fc963932bf3c929bdf27d835d44e9 ~ 4a41bb9f2b402469d425a1c13359d3b3ea4e6403 -
Linux Linux 6.8 -

II. Public POCs for CVE-2024-42108

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III. Intelligence Information for CVE-2024-42108

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Patches & Fixes for CVE-2024-42108 (1)

Other References for CVE-2024-42108 (2)

Same Patch Batch · Linux · 2024-07-30 · 70 CVEs total

CVE-2024-42225 8.3 HIGH wifi: mt76: replace skb_put with skb_put_zero
CVE-2024-42120 7.8 HIGH drm/amd/display: Check pipe offset before setting vblank
CVE-2024-42117 7.8 HIGH drm/amd/display: ASSERT when failing to find index by plane/stream id
CVE-2024-42115 7.8 HIGH jffs2: Fix potential illegal address access in jffs2_free_inode
CVE-2024-42112 7.8 HIGH net: txgbe: free isb resources at the right time
CVE-2024-42111 7.8 HIGH btrfs: always do the basic checks for btrfs_qgroup_inherit structure
CVE-2024-42109 7.8 HIGH netfilter: nf_tables: unconditionally flush pending work before notifier
CVE-2024-42105 7.8 HIGH nilfs2: fix inode number range checks
CVE-2024-42104 7.8 HIGH nilfs2: add missing check for inode numbers on directory entries
CVE-2024-42103 7.8 HIGH btrfs: fix adding block group to a reclaim list and the unused list during reclaim
CVE-2024-42162 7.8 HIGH gve: Account for stopped queues when reading NIC stats
CVE-2024-42099 7.8 HIGH s390/dasd: Fix invalid dereferencing of indirect CCW data pointer
CVE-2024-42132 7.6 HIGH bluetooth/hci: disallow setting handle bigger than HCI_CONN_HANDLE_MAX
CVE-2024-42133 7.6 HIGH Bluetooth: Ignore too large handle values in BIG
CVE-2024-42110 7.5 HIGH net: ntb_netdev: Move ntb_netdev_rx_handler() to call netif_rx() from __netif_rx()
CVE-2024-42152 7.5 HIGH nvmet: fix a possible leak when destroy a ctrl during qp establishment
CVE-2024-42145 7.5 HIGH IB/core: Implement a limit on UMAD receive List
CVE-2024-42123 7.0 HIGH drm/amdgpu: fix double free err_addr pointer warnings
CVE-2024-42224 7.0 HIGH net: dsa: mv88e6xxx: Correct check for empty list
CVE-2024-42161 bpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD

Showing top 20 of 70 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-42108

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